The Simple Backpack is a one-layer binding technique for back carrying with a wrap. You can carry newborns safely with the Simple Backpack (you have to put the baby into the pouch beforehand and then push it gently onto your back). You need a wrap in size 3-5. Larger wraps can be closed with fancy finishes.
But a Backpack is also suitable for larger children. For long walks with larger children, we recommend using a shoulder relieving variation, like the Double Hammock.